Thermostat



No. 751,362. PATENTED PEB. 2, 1904.

J. L. WARD.

THERMOSTAT.

APPLICATION FILED JULY 9, 1903.

NO MODEL.

l l TSKSl SV' |*l'l''l nlveuroz 61H01 n e 13 'atented February 2, 1904.

PATENT OFFICE.

JOHN L. VVARD, OF ORD, NEBRASKA.

THERMOSTAT.

SPECIFICATION forming part of Letters Patent No.751,362, dated February 2, 1904.

Application filed July 9, 1903. Serial No. 164,873. (No model.)

To @ZZ whom, it may concer-n,.-

Be it known that I, JOHN L. WARD, a citizen of the United States, residing at Ord, in the county of Valley and State of Nebraska, have invented new and useful Improvements in' Thermostats, of which the following is a specillication.

My invention relates to new and useful improvements in thermostats; and its object is to provide a simple and inexpensive device operated by the expansion and contraction of one of the parts thereof and adapted to automatically sound an alarm when the surrounding temperature reaches a predetermined degree. Y

The invention consists in providing a standard which is graduated to indicate degrees and has an adjustable contact-plate which is arranged in a circuit including an alarm and a battery. A lever which is fulcrumed at a point between its ends is provided and is adapted to be moved into contact with the plate, and thereby complete a circuit and cause the sounding of the alarm. This lever is operated by an expansible strip of novel form.

The invention also consists in providing an expansible bar so constructed as to cause the same to be quickly affected by the heat of the surrounding atmosphere.

The invention also consists in the further novel construction, combination, and arrangement of parts hereinafter more fully described and claimed, and illustrated in the accompanying drawings, in which4 Figure 1 is a front elevation of the apparatus. Fig. 2 is a section on line 2 2, Fig. 1; and Fig. 3 is a section on. line 8 3, Fig. 1.

Referring to the figures by numerals of reference, 1 is a base having standards 2 and 8 thereon, the last-mentioned standard being cut away at its upper end, as shown at 4, to form a ledge for the support at one end of an expansible bar 5, which is in the form of a cross in cross-section and is adjustably mounted by means of the thumb-screw 6 in the standard 2. A bell-crank lever 7 is fulcrumed in the forked upper end of the standard 3, and the short arm thereof contacts with the end of the bar 5, while the long arm extends across one face of a standard 8, having graduations thereon for indicating the degrees of temperature. This standard is slotted longitudinally, as shown at 9, and arranged within the slot is an adjustable contact-plate 10, which is connected by means of a wire 11 to an alarm 12, preferably in the form of an electric bell. A- wire 13 serves to connect this alarm to one pole of a battery 14, and another wire, 15, connects the other pole of the battery to the pivot-pin 16 of the bell-crank lever 7.

The apparatus herein described is adapted to be placed in any desired position, and when the temperature rises to the degree indicated by the contact-plate 10 the bar 5 will be expanded sufficiently to swing the bell-crank lever upon its pivot-pin 16 and upward into contact with the plate 10. A circuit will thus be promptly established from the battery to the alarm 12. By forming the bar 5 in the manner shown and described the area presented to the atmosphere is increased, and therefore the action of the heat lupon the bar is accelerated. It will of course be understood that the plate 10 can be adjusted to adesired point upon the standard 8, so as to cause the alarm to be sounded when any predetermined temperature is reached.

In the foregoing description I have shown the preferred form of my invention; but I do not limit myself thereto, as I am aware that modiiications may be made therein without departing from the spirit or sacriiicing the advantages thereof, and l therefore reserve the right to make such changes and alterations as may fairly fall within the scope of my invention.

Having thus described the invention, what is claimedas new is4 1. The combination with a graduated standard having an adjustable contact-plate thereon; of a bell-crank lever, an expansible bar contacting with and adapted to operate the bell-crank lever, and an alarm and battery, said alarm and battery being included in an electric circuit with a contact-plate and lever.

2. The combination with a graduated standard, of an adjustable contactplate secured thereto, a bell-crank lever, an expansible bar contacting therewith and adapted to operate the same, an alarm, a battery, said alarm and lOO battery being included in a circuit With the bell-crank lever and contact-plate, and means for adjusting the expansible bar.

3. The combination with a base having standarde thereon, of an expansible bar loosely supported in the standards, means for adjusting' Said bar longitudinally, a bell-crank level' pivoted upon one of the standards and contacting with the expansible bar, graduated standards,

Aa contact-plate adjustably Secured thereto in the path of the bell-crank lever, Said contactplate and lever being included in an electric circuit containing a source of electricity and an alarm.

4.-. rlhe combination with a base, of standards thereon, an expansible bar loosely mounted upon the standards and cross-shaped in section, means for adjusting the bar longitudi- JOHN L. lVARl).

Witnesses: p

ORLA S. GooDnreH, C. G. STARR. 

